BOARD00531

• Board Meeting Date: 5/7/1969
• Description: Agenda or Table of Contents, Minutes, Memos
• Board Meetings - Doc Type: Meeting

likes to taste some of this water at 4000
to 5000 parts per million of dissolved
solids. Actually. the threshold of taste
with some people is around 2000 parts per
million; for other people about 3000.

I

The system is complex. This is really
what we would like to strive for next in
analyzing and modeling the system. To look
at the water quality picture and be able to
predict what is going to happen in advance
so that we will not accept a management plan
that will get us into trouble in the terms
of water quality. The system is complex and
the kind of illustrations I have shown up
here are very simple ones. They show just
for a single ditch system. We have a very
complex ditch system down in the Arkansas
Valley as you can see here. We have a number
of ditches running off from the mainstream;
water being diverted; water applied to the
land; some of it percolates down through the
solid material back to the stream; some of
it is intercepted by wells on its course;
some of it is returned to the stream by waste
ways. In order to properly analyze this we
need some very sophisticated calculating tools
and we believe we have such a tool at this
time.

I

To show that we have been making some
progress in other areas. we are putting to-
gether similar data and will start the model
for the South Platte hopefully the first of
this July. As you can see. in the South
Platte the pumpage pattern has increased sub-
stantially over a period of years. This is
1930 when there was very little pumpage.
This is 1967. The period during the 1960's
here averaged some 400.000 to 500.000 acre-
feet of water pumped per year. A substantial
amount. This has given the area a great
amount of benefit and I think it shows up
quite clearly in this next slide.